Detailed Description

Constraint handler for absolute power constraints $\textrm{lhs} \leq \textrm{sign}(x+a) |x+a|^n + c z \leq \textrm{rhs}$ .

Author: Stefan Vigerske

Definition in file cons_abspower.c.

#include <assert.h>
#include <string.h>
#include <ctype.h>
#include "scip/cons_abspower.h"
#include "scip/cons_nonlinear.h"
#include "scip/cons_indicator.h"
#include "scip/cons_quadratic.h"
#include "scip/cons_linear.h"
#include "scip/cons_varbound.h"
#include "scip/intervalarith.h"
#include "scip/heur_subnlp.h"
#include "scip/heur_trysol.h"
#include "scip/debug.h"

Go to the source code of this file.

Macros
#define	CONSHDLR_NAME "abspower"

#define	CONSHDLR_DESC "constraint handler for absolute power constraints lhs <= sign(x+offset)abs(x+offset)^n + c*z <= rhs"

#define	CONSHDLR_SEPAPRIORITY 0

#define	CONSHDLR_ENFOPRIORITY -30

#define	CONSHDLR_CHECKPRIORITY -3500000

#define	CONSHDLR_SEPAFREQ 1

#define	CONSHDLR_PROPFREQ 1

#define	CONSHDLR_EAGERFREQ 100

#define	CONSHDLR_MAXPREROUNDS -1

#define	CONSHDLR_DELAYSEPA FALSE

#define	CONSHDLR_DELAYPROP FALSE

#define	CONSHDLR_NEEDSCONS TRUE

#define	CONSHDLR_PRESOLTIMING SCIP_PRESOLTIMING_FAST \| SCIP_PRESOLTIMING_MEDIUM

#define	CONSHDLR_PROP_TIMING SCIP_PROPTIMING_ALWAYS

#define	QUADCONSUPGD_PRIORITY 50000

#define	NONLINCONSUPGD_PRIORITY 50000

#define	PROPVARTOL SCIPepsilon(scip)

#define	PROPSIDETOL SCIPepsilon(scip)

#define	INITLPMAXVARVAL 1000.0

#define	DECL_MYPOW(x) SCIP_Real x (SCIP_Real base, SCIP_Real exponent)

#define	SIGN(x) ((x) >= 0.0 ? 1.0 : -1.0)

#define	ROOTS_KNOWN 10

Typedefs
typedef enum Proprule	PROPRULE

Enumerations
enum	Proprule { PROPRULE_1, PROPRULE_2, PROPRULE_3, PROPRULE_4, PROPRULE_INVALID, PROPRULE_INVALID = 0, PROPRULE_1 = 1, PROPRULE_2 = 2, PROPRULE_3 = 3, PROPRULE_4 = 4, PROPRULE_1_CORETIMES = 1, PROPRULE_2_EDGEFINDING = 2, PROPRULE_3_TTEF = 3, PROPRULE_1_RHS = 1, PROPRULE_1_LHS = 2, PROPRULE_1_RANGEDROW = 3, PROPRULE_INVALID = 0, PROPRULE_1, PROPRULE_2, PROPRULE_3, PROPRULE_4, PROPRULE_INVALID, PROPRULE_1, PROPRULE_2, PROPRULE_3, PROPRULE_4, PROPRULE_0, PROPRULE_1, PROPRULE_INTLB, PROPRULE_INTUB, PROPRULE_INVALID }

Functions
static	DECL_MYPOW (square)

static	SCIP_DECL_EVENTEXEC (processVarEvent)

static SCIP_RETCODE	catchVarEvents (SCIP scip, SCIP_EVENTHDLR eventhdlr, SCIP_CONS *cons)

static SCIP_RETCODE	dropVarEvents (SCIP scip, SCIP_EVENTHDLR eventhdlr, SCIP_CONS *cons)

static	SCIP_DECL_HASHGETKEY (presolveFindDuplicatesGetKey)

static	SCIP_DECL_HASHKEYEQ (presolveFindDuplicatesKeyEQ)

static	SCIP_DECL_HASHKEYVAL (presolveFindDuplicatesKeyVal)

static	SCIP_DECL_HASHKEYEQ (presolveFindDuplicatesKeyEQ2)

static	SCIP_DECL_HASHKEYVAL (presolveFindDuplicatesKeyVal2)

static SCIP_RETCODE	presolveFindDuplicatesUpgradeCons (SCIP scip, SCIP_CONS cons1, SCIP_CONS cons2, SCIP_Bool infeas, int nupgdconss, int ndelconss, int *naggrvars)

static void	presolveFindDuplicatesSolveEquations (SCIP scip, SCIP_Bool infeas, SCIP_Real xval, SCIP_Real zval, SCIP_Real exponent, SCIP_Real xoffset1, SCIP_Real zcoef1, SCIP_Real rhs1, SCIP_Real xoffset2, SCIP_Real zcoef2, SCIP_Real rhs2)

static SCIP_RETCODE	presolveFindDuplicates (SCIP scip, SCIP_CONSHDLR conshdlr, SCIP_CONS *conss, int nconss, int nupgdconss, int ndelconss, int naddconss, int nfixedvars, int naggrvars, SCIP_Bool success, SCIP_Bool infeas)

static SCIP_RETCODE	presolveDual (SCIP scip, SCIP_CONS cons, SCIP_Bool cutoff, int ndelconss, int *nfixedvars)

static SCIP_RETCODE	tightenBounds (SCIP scip, SCIP_VAR var, SCIP_INTERVAL bounds, SCIP_Bool force, SCIP_CONS cons, SCIP_RESULT result, int nchgbds, int nfixedvars, int *naddconss)

static void	computeBoundsZ (SCIP scip, SCIP_CONS cons, SCIP_INTERVAL xbnds, SCIP_INTERVAL *zbnds)

static void	computeBoundsX (SCIP scip, SCIP_CONS cons, SCIP_INTERVAL zbnds, SCIP_INTERVAL *xbnds)

static SCIP_RETCODE	checkFixedVariables (SCIP scip, SCIP_CONSHDLR conshdlr, SCIP_CONS cons, int ndelconss, int nupgdconss, int nchgbds, int nfixedvars, SCIP_RESULT result)

static SCIP_Real	getGradientMaxElement (SCIP scip, SCIP_CONS cons, SCIP_SOL *sol)

static SCIP_RETCODE	computeViolation (SCIP scip, SCIP_CONSHDLR conshdlr, SCIP_CONS cons, SCIP_SOL sol, SCIP_Real *viol)

static SCIP_RETCODE	computeViolations (SCIP scip, SCIP_CONSHDLR conshdlr, SCIP_CONS *conss, int nconss, SCIP_SOL sol, SCIP_CONS **maxviolcon)

static SCIP_Real	proposeBranchingPoint (SCIP scip, SCIP_CONS cons, int preferzero, SCIP_Bool branchminconverror)

static SCIP_RETCODE	registerBranchingCandidates (SCIP scip, SCIP_CONSHDLR conshdlr, SCIP_CONS *conss, int nconss, int nnotify)

static SCIP_RETCODE	registerLargeLPValueVariableForBranching (SCIP scip, SCIP_CONS conss, int nconss, SCIP_VAR *brvar)

static SCIP_RETCODE	resolvePropagation (SCIP scip, SCIP_CONS cons, SCIP_VAR infervar, PROPRULE proprule, SCIP_BOUNDTYPE boundtype, SCIP_BDCHGIDX bdchgidx)

static SCIP_RETCODE	analyzeConflict (SCIP scip, SCIP_CONS cons, SCIP_VAR *infervar, PROPRULE proprule, SCIP_BOUNDTYPE boundtype)

static SCIP_RETCODE	propagateCons (SCIP scip, SCIP_CONSHDLR conshdlr, SCIP_CONS cons, SCIP_Bool canaddcons, SCIP_Bool cutoff, int nchgbds, int naddconss)

static SCIP_RETCODE	addVarbound (SCIP scip, SCIP_CONS cons, SCIP_Bool addcons, SCIP_VAR var, SCIP_VAR vbdvar, SCIP_Real vbdcoef, SCIP_Real lhs, SCIP_Real rhs, SCIP_Bool infeas, int nbdchgs, int *naddconss)

static SCIP_RETCODE	propagateVarbounds (SCIP scip, SCIP_CONSHDLR conshdlr, SCIP_CONS cons, SCIP_Bool infeas, int nbdchgs, int naddconss)

static SCIP_RETCODE	generateLinearizationCut (SCIP scip, SCIP_ROW row, SCIP_CONSHDLR conshdlr, SCIP_Real refpoint, SCIP_Real exponent, SCIP_Real xoffset, SCIP_Real xmult, SCIP_Real zcoef, SCIP_Real rhs, SCIP_VAR x, SCIP_VAR z, SCIP_Bool islocal)

static SCIP_RETCODE	generateLinearizationCutProject (SCIP scip, SCIP_ROW row, SCIP_CONSHDLR conshdlr, SCIP_Real xref, SCIP_Real zref, SCIP_Real xmin, SCIP_Real exponent, SCIP_Real xoffset, SCIP_Real xmult, SCIP_Real zcoef, SCIP_Real rhs, SCIP_VAR x, SCIP_VAR z, SCIP_Bool islocal)

static SCIP_RETCODE	generateSecantCut (SCIP scip, SCIP_ROW row, SCIP_CONSHDLR conshdlr, SCIP_SOL sol, SCIP_Real xlb, SCIP_Real xub, SCIP_Real exponent, SCIP_Real xoffset, DECL_MYPOW((mypow)), SCIP_Real xmult, SCIP_Real zcoef, SCIP_Real rhs, SCIP_VAR x, SCIP_VAR z)

static SCIP_RETCODE	generateSecantCutNoCheck (SCIP scip, SCIP_ROW row, SCIP_CONSHDLR conshdlr, SCIP_Real xlb, SCIP_Real xub, SCIP_Real exponent, SCIP_Real xoffset, DECL_MYPOW((mypow)), SCIP_Real xmult, SCIP_Real zcoef, SCIP_Real rhs, SCIP_VAR x, SCIP_VAR *z)

static SCIP_RETCODE	generateCut (SCIP scip, SCIP_CONS cons, SCIP_SOL sol, SCIP_ROW *row, SCIP_Bool onlyinbounds)

static SCIP_RETCODE	separatePoint (SCIP scip, SCIP_CONSHDLR conshdlr, SCIP_CONS *conss, int nconss, int nusefulconss, SCIP_SOL sol, SCIP_Real minefficacy, SCIP_Bool inenforcement, SCIP_Bool onlyinbounds, SCIP_Bool success, SCIP_Bool cutoff, SCIP_Real *bestefficacy)

static SCIP_RETCODE	addLinearizationCuts (SCIP scip, SCIP_CONSHDLR conshdlr, SCIP_CONS *conss, int nconss, SCIP_SOL ref, SCIP_Bool *separatedlpsol, SCIP_Real minefficacy)

static	SCIP_DECL_EVENTEXEC (processNewSolutionEvent)

static SCIP_RETCODE	proposeFeasibleSolution (SCIP scip, SCIP_CONSHDLR conshdlr, SCIP_CONS *conss, int nconss, SCIP_SOL sol)

static SCIP_RETCODE	createNlRow (SCIP scip, SCIP_CONS cons)

static	SCIP_DECL_QUADCONSUPGD (quadconsUpgdAbspower)

static	SCIP_DECL_NONLINCONSUPGD (nonlinconsUpgdAbspower)

static	SCIP_DECL_EXPRGRAPHNODEREFORM (exprgraphnodeReformAbspower)

static	SCIP_DECL_CONSHDLRCOPY (conshdlrCopyAbspower)

static	SCIP_DECL_CONSFREE (consFreeAbspower)

static	SCIP_DECL_CONSINIT (consInitAbspower)

static	SCIP_DECL_CONSEXIT (consExitAbspower)

static	SCIP_DECL_CONSINITPRE (consInitpreAbspower)

static	SCIP_DECL_CONSEXITPRE (consExitpreAbspower)

static	SCIP_DECL_CONSINITSOL (consInitsolAbspower)

static	SCIP_DECL_CONSEXITSOL (consExitsolAbspower)

static	SCIP_DECL_CONSDELETE (consDeleteAbspower)

static	SCIP_DECL_CONSTRANS (consTransAbspower)

static	SCIP_DECL_CONSINITLP (consInitlpAbspower)

static	SCIP_DECL_CONSSEPALP (consSepalpAbspower)

static	SCIP_DECL_CONSSEPASOL (consSepasolAbspower)

static	SCIP_DECL_CONSENFOLP (consEnfolpAbspower)

static	SCIP_DECL_CONSENFOPS (consEnfopsAbspower)

static	SCIP_DECL_CONSPROP (consPropAbspower)

static	SCIP_DECL_CONSPRESOL (consPresolAbspower)

static	SCIP_DECL_CONSRESPROP (consRespropAbspower)

static	SCIP_DECL_CONSLOCK (consLockAbspower)

static	SCIP_DECL_CONSACTIVE (consActiveAbspower)

static	SCIP_DECL_CONSENABLE (consEnableAbspower)

static	SCIP_DECL_CONSDISABLE (consDisableAbspower)

static	SCIP_DECL_CONSPRINT (consPrintAbspower)

static	SCIP_DECL_CONSCHECK (consCheckAbspower)

static	SCIP_DECL_CONSCOPY (consCopyAbspower)

static	SCIP_DECL_CONSPARSE (consParseAbspower)

static	SCIP_DECL_CONSGETVARS (consGetVarsAbspower)

static	SCIP_DECL_CONSGETNVARS (consGetNVarsAbspower)

SCIP_RETCODE	SCIPincludeConshdlrAbspower (SCIP *scip)

SCIP_RETCODE	SCIPcreateConsAbspower (SCIP scip, SCIP_CONS cons, const char name, SCIP_VAR x, SCIP_VAR z, SCIP_Real exponent, SCIP_Real xoffset, SCIP_Real zcoef, SCIP_Real lhs, SCIP_Real rhs, SCIP_Bool initial, SCIP_Bool separate, SCIP_Bool enforce, SCIP_Bool check, SCIP_Bool propagate, SCIP_Bool local, SCIP_Bool modifiable, SCIP_Bool dynamic, SCIP_Bool removable, SCIP_Bool stickingatnode)

SCIP_RETCODE	SCIPcreateConsBasicAbspower (SCIP scip, SCIP_CONS cons, const char name, SCIP_VAR x, SCIP_VAR z, SCIP_Real exponent, SCIP_Real xoffset, SCIP_Real zcoef, SCIP_Real lhs, SCIP_Real rhs)

SCIP_RETCODE	SCIPgetNlRowAbspower (SCIP scip, SCIP_CONS cons, SCIP_NLROW **nlrow)

SCIP_VAR *	SCIPgetNonlinearVarAbspower (SCIP scip, SCIP_CONS cons)

SCIP_VAR *	SCIPgetLinearVarAbspower (SCIP scip, SCIP_CONS cons)

SCIP_Real	SCIPgetExponentAbspower (SCIP scip, SCIP_CONS cons)

SCIP_Real	SCIPgetOffsetAbspower (SCIP scip, SCIP_CONS cons)

SCIP_Real	SCIPgetCoefLinearAbspower (SCIP scip, SCIP_CONS cons)

SCIP_Real	SCIPgetLhsAbspower (SCIP scip, SCIP_CONS cons)

SCIP_Real	SCIPgetRhsAbspower (SCIP scip, SCIP_CONS cons)

SCIP_Real	SCIPgetViolationAbspower (SCIP scip, SCIP_CONS cons, SCIP_SOL *sol)

Variables
static SCIP_Real	roots [ROOTS_KNOWN+1]

Macro Definition Documentation

#define CONSHDLR_NAME "abspower"

Definition at line 39 of file cons_abspower.c.

Referenced by SCIP_DECL_CONSEXITSOL(), SCIP_DECL_CONSHDLRCOPY(), SCIP_DECL_CONSINITSOL(), SCIPcreateConsAbspower(), SCIPgetCoefLinearAbspower(), SCIPgetExponentAbspower(), SCIPgetLhsAbspower(), SCIPgetLinearVarAbspower(), SCIPgetNlRowAbspower(), SCIPgetNonlinearVarAbspower(), SCIPgetOffsetAbspower(), SCIPgetRhsAbspower(), SCIPgetViolationAbspower(), and SCIPincludeConshdlrAbspower().

#define CONSHDLR_DESC "constraint handler for absolute power constraints lhs <= sign(x+offset)abs(x+offset)^n + c*z <= rhs"

Definition at line 40 of file cons_abspower.c.

Referenced by SCIPincludeConshdlrAbspower().

#define CONSHDLR_SEPAPRIORITY 0

priority of the constraint handler for separation

Definition at line 41 of file cons_abspower.c.

Referenced by SCIPincludeConshdlrAbspower().

#define CONSHDLR_ENFOPRIORITY -30

priority of the constraint handler for constraint enforcing

Definition at line 42 of file cons_abspower.c.

Referenced by SCIPincludeConshdlrAbspower().

#define CONSHDLR_CHECKPRIORITY -3500000

priority of the constraint handler for checking feasibility

Definition at line 43 of file cons_abspower.c.

Referenced by SCIPincludeConshdlrAbspower().

#define CONSHDLR_SEPAFREQ 1

frequency for separating cuts; zero means to separate only in the root node

Definition at line 44 of file cons_abspower.c.

Referenced by SCIPincludeConshdlrAbspower().

#define CONSHDLR_PROPFREQ 1

frequency for propagating domains; zero means only preprocessing propagation

Definition at line 45 of file cons_abspower.c.

Referenced by SCIPincludeConshdlrAbspower().

#define CONSHDLR_EAGERFREQ 100

frequency for using all instead of only the useful constraints in separation, propagation and enforcement, -1 for no eager evaluations, 0 for first only

Definition at line 46 of file cons_abspower.c.

Referenced by SCIPincludeConshdlrAbspower().

#define CONSHDLR_MAXPREROUNDS -1

maximal number of presolving rounds the constraint handler participates in (-1: no limit)

Definition at line 49 of file cons_abspower.c.

Referenced by SCIPincludeConshdlrAbspower().

#define CONSHDLR_DELAYSEPA FALSE

should separation method be delayed, if other separators found cuts?

Definition at line 50 of file cons_abspower.c.

Referenced by SCIPincludeConshdlrAbspower().

#define CONSHDLR_DELAYPROP FALSE

should propagation method be delayed, if other propagators found reductions?

Definition at line 51 of file cons_abspower.c.

Referenced by SCIPincludeConshdlrAbspower().

#define CONSHDLR_NEEDSCONS TRUE

should the constraint handler be skipped, if no constraints are available?

Definition at line 52 of file cons_abspower.c.

Referenced by SCIPincludeConshdlrAbspower().

#define CONSHDLR_PRESOLTIMING SCIP_PRESOLTIMING_FAST | SCIP_PRESOLTIMING_MEDIUM

Definition at line 54 of file cons_abspower.c.

Referenced by SCIPincludeConshdlrAbspower().

#define CONSHDLR_PROP_TIMING SCIP_PROPTIMING_ALWAYS

when should the constraint handlers propagation routines be called?

Definition at line 55 of file cons_abspower.c.

Referenced by SCIPincludeConshdlrAbspower().

#define QUADCONSUPGD_PRIORITY 50000

priority of the constraint handler for upgrading of quadratic constraints

Definition at line 57 of file cons_abspower.c.

Referenced by SCIPincludeConshdlrAbspower().

#define NONLINCONSUPGD_PRIORITY 50000

priority of the constraint handler for upgrading of nonlinear constraints and reformulating expression graph nodes

Definition at line 58 of file cons_abspower.c.

Referenced by SCIPincludeConshdlrAbspower().

#define PROPVARTOL SCIPepsilon(scip)

tolerance to add to variable bounds in domain propagation

Definition at line 64 of file cons_abspower.c.

Referenced by computeBoundsX(), computeBoundsZ(), and propagateCons().

#define PROPSIDETOL SCIPepsilon(scip)

tolerance to add to constraint sides in domain propagation

Definition at line 65 of file cons_abspower.c.

Referenced by computeBoundsX(), computeBoundsZ(), and propagateCons().

#define INITLPMAXVARVAL 1000.0

maximal absolute value of variable for still generating a linearization cut at that point in initlp

Definition at line 66 of file cons_abspower.c.

Referenced by SCIP_DECL_CONSINITLP().

#define DECL_MYPOW ( x ) SCIP_Real x (SCIP_Real base, SCIP_Real exponent)

power function type to be used by a constraint instead of the general pow

Definition at line 69 of file cons_abspower.c.

#define SIGN ( x ) ((x) >= 0.0 ? 1.0 : -1.0)

sign of a value (-1 or +1)

0.0 has sign +1

Definition at line 75 of file cons_abspower.c.

Referenced by checkFixedVariables(), computeBoundsX(), computeBoundsZ(), computeViolation(), generateSecantCut(), generateSecantCutNoCheck(), presolveDual(), presolveFindDuplicates(), propagateCons(), propagateVarbounds(), proposeFeasibleSolution(), SCIP_DECL_CONSPRESOL(), SCIP_DECL_EXPRGRAPHNODEREFORM(), and SCIPgetViolationAbspower().

#define ROOTS_KNOWN 10

up to which (integer) exponents precomputed roots have been stored

Definition at line 82 of file cons_abspower.c.

Referenced by SCIP_DECL_CONSINITSOL().

Typedef Documentation

typedef enum Proprule PROPRULE

Definition at line 170 of file cons_abspower.c.

Enumeration Type Documentation

enum Proprule

Enumerator
PROPRULE_1	left hand side and bounds on z -> lower bound on x
PROPRULE_2	left hand side and upper bound on x -> bound on z
PROPRULE_3	right hand side and bounds on z -> upper bound on x
PROPRULE_4	right hand side and lower bound on x -> bound on z
PROPRULE_INVALID	propagation was applied without a specific propagation rule
PROPRULE_INVALID	propagation was applied without a specific propagation rule
PROPRULE_1	v_i = FALSE => r = FALSE
PROPRULE_2	r = TRUE => v_i = TRUE for all i
PROPRULE_3	v_i = TRUE for all i => r = TRUE
PROPRULE_4	r = FALSE, v_i = TRUE for all i except j => v_j = FALSE
PROPRULE_1_CORETIMES	core-time propagator
PROPRULE_2_EDGEFINDING	edge-finder
PROPRULE_3_TTEF	time-table edeg-finding
PROPRULE_1_RHS	activity residuals of all other variables tighten bounds of single variable due to the right hand side of the inequality
PROPRULE_1_LHS	activity residuals of all other variables tighten bounds of single variable due to the left hand side of the inequality
PROPRULE_1_RANGEDROW	fixed variables and gcd of all left variables tighten bounds of a single variable in this reanged row
PROPRULE_INVALID	propagation was applied without a specific propagation rule
PROPRULE_1	v_i = TRUE => r = TRUE
PROPRULE_2	r = FALSE => v_i = FALSE for all i
PROPRULE_3	v_i = FALSE for all i => r = FALSE
PROPRULE_4	r = TRUE, v_i = FALSE for all i except j => v_j = TRUE
PROPRULE_INVALID	propagation was applied without a specific propagation rule
PROPRULE_1	left hand side and bounds on y -> lower bound on x
PROPRULE_2	left hand side and upper bound on x -> bound on y
PROPRULE_3	right hand side and bounds on y -> upper bound on x
PROPRULE_4	right hand side and lower bound on x -> bound on y
PROPRULE_0	all variables are fixed => fix integral variable
PROPRULE_1	all except one variable fixed => fix remaining variable
PROPRULE_INTLB	lower bound propagation of integral variable
PROPRULE_INTUB	upper bound propagation of integral variable
PROPRULE_INVALID	propagation was applied without a specific propagation rule

Definition at line 162 of file cons_abspower.c.

Function Documentation

static DECL_MYPOW ( square )

static

power function for square, that should be faster than using pow(x, 2.0)

Definition at line 178 of file cons_abspower.c.

static SCIP_DECL_EVENTEXEC ( processVarEvent )

static

process variable event

Definition at line 186 of file cons_abspower.c.

References FALSE, NULL, SCIP_Bool, SCIP_EVENTTYPE_BOUNDTIGHTENED, SCIP_OKAY, and SCIPeventGetType().

static SCIP_RETCODE catchVarEvents	(	SCIP *	scip,
		SCIP_EVENTHDLR *	eventhdlr,
		SCIP_CONS *	cons
	)

static

catch variable bound tightening events

Parameters

scip	SCIP data structure
eventhdlr	event handler for variables
cons	constraint for which to catch bound change events

Definition at line 204 of file cons_abspower.c.

References FALSE, NULL, SCIP_CALL, SCIP_EVENTTYPE_DISABLED, SCIP_EVENTTYPE_LBTIGHTENED, SCIP_EVENTTYPE_UBTIGHTENED, SCIP_OKAY, SCIP_VARSTATUS_MULTAGGR, SCIPcatchVarEvent(), SCIPconsGetData(), SCIPisInfinity(), SCIPvarGetStatus(), and TRUE.

Referenced by checkFixedVariables(), presolveFindDuplicates(), and SCIP_DECL_CONSENABLE().

static SCIP_RETCODE dropVarEvents	(	SCIP *	scip,
		SCIP_EVENTHDLR *	eventhdlr,
		SCIP_CONS *	cons
	)

static

drop variable bound tightening events

Parameters

scip	SCIP data structure
eventhdlr	event handler for variables
cons	constraint for which to drop bound change events

Definition at line 266 of file cons_abspower.c.

References NULL, SCIP_CALL, SCIP_EVENTTYPE_DISABLED, SCIP_EVENTTYPE_LBTIGHTENED, SCIP_EVENTTYPE_UBTIGHTENED, SCIP_OKAY, SCIP_VARSTATUS_MULTAGGR, SCIPconsGetData(), SCIPdropVarEvent(), SCIPisInfinity(), and SCIPvarGetStatus().

Referenced by checkFixedVariables(), presolveFindDuplicates(), and SCIP_DECL_CONSDISABLE().

static SCIP_DECL_HASHGETKEY ( presolveFindDuplicatesGetKey )

static

get key of hash element

Definition at line 324 of file cons_abspower.c.

static SCIP_DECL_HASHKEYEQ ( presolveFindDuplicatesKeyEQ )

static

checks if two constraints have the same x variable, the same exponent, and either the same offset or the same linear variable and are both equality constraint

Definition at line 331 of file cons_abspower.c.

References FALSE, NULL, SCIPconsGetData(), and TRUE.

static SCIP_DECL_HASHKEYVAL ( presolveFindDuplicatesKeyVal )

static

get value of hash element when comparing on x

Definition at line 355 of file cons_abspower.c.

References NULL, and SCIPconsGetData().

static SCIP_DECL_HASHKEYEQ ( presolveFindDuplicatesKeyEQ2 )

static

checks if two constraints have the same z variable and the same exponent

Definition at line 367 of file cons_abspower.c.

References FALSE, NULL, SCIPconsGetData(), and TRUE.

static SCIP_DECL_HASHKEYVAL ( presolveFindDuplicatesKeyVal2 )

static

get value of hash element when comparing on z

Definition at line 388 of file cons_abspower.c.

References NULL, and SCIPconsGetData().

static SCIP_RETCODE presolveFindDuplicatesUpgradeCons	(	SCIP *	scip,
		SCIP_CONS *	cons1,
		SCIP_CONS *	cons2,
		SCIP_Bool *	infeas,
		int *	nupgdconss,
		int *	ndelconss,
		int *	naggrvars
	)

static

upgrades a signpower constraint to a linear constraint if a second signpower constraint with same nonlinear term is available

Parameters

scip	SCIP data structure
cons1	constraint to upgrade to a linear constraint
cons2	constraint which defines a relation for x\|x\|^{n-1}
infeas	buffer where to indicate if infeasibility has been detected
nupgdconss	buffer where to add number of upgraded conss
ndelconss	buffer where to add number of deleted conss
naggrvars	buffer where to add number of aggregated variables

Definition at line 400 of file cons_abspower.c.

References NULL, SCIP_Bool, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIPaddCons(), SCIPaggregateVars(), SCIPconsGetData(), SCIPconsGetName(), SCIPconsIsChecked(), SCIPconsIsDynamic(), SCIPconsIsEnforced(), SCIPconsIsInitial(), SCIPconsIsLocal(), SCIPconsIsModifiable(), SCIPconsIsPropagated(), SCIPconsIsRemovable(), SCIPconsIsSeparated(), SCIPconsIsStickingAtNode(), SCIPcreateConsLinear(), SCIPdelCons(), SCIPisEQ(), SCIPisInfinity(), and SCIPreleaseCons().

Referenced by presolveFindDuplicates().

static void presolveFindDuplicatesSolveEquations	(	SCIP *	scip,
		SCIP_Bool *	infeas,
		SCIP_Real *	xval,
		SCIP_Real *	zval,
		SCIP_Real	exponent,
		SCIP_Real	xoffset1,
		SCIP_Real	zcoef1,
		SCIP_Real	rhs1,
		SCIP_Real	xoffset2,
		SCIP_Real	zcoef2,
		SCIP_Real	rhs2
	)

static

solves a system of two absolute power equations Given: (x+xoffset1)|x+xoffset1|^{exponent-1} + zcoef1 * z == rhs1 and (x+xoffset2)|x+xoffset2|^{exponent-1} + zcoef2 * z == rhs2 with xoffset1 != xoffset2 and zcoef1 * rhs2 == zcoef2 * rhs1 and exponent == 2, finds values for x and z that satisfy these equations, or reports infeasibility if no solution exists.

Multiplying the second equation by -zcoef1/zcoef2 and adding it to the first one gives (x+xoffset1)|x+xoffset1| - zcoef1/zcoef2 (x+offset2)|x+offset2| == 0

In general, for zcoef1 / zcoef2 > 0.0, we get x = (xoffset2 - xoffset1) / (sqrt(zcoef2 / zcoef1) - 1.0) - xoffset1, and for zcoef1 / zcoef2 < 0.0, we get x = (xoffset2 - xoffset1) / (-sqrt(-zcoef2 / zcoef1) - 1.0) - xoffset1.

This then yields z = (rhs1 - (x+xoffset1)|x+xoffset1|) / zcoef1.

Parameters

scip	SCIP data structure
infeas	buffer to indicate if the system of equations has no solution
xval	buffer to store value of x in the solution, if any
zval	buffer to store value of z in the solution, if any
exponent	exponent in absolute power equations
xoffset1	offset for x in first absolute power equation
zcoef1	coefficient of z in first absolute power equation
rhs1	right-hand-side in first absolute power equation
xoffset2	offset for x in second absolute power equation
zcoef2	coefficient of z in second absolute power equation
rhs2	right-hand-side in second absolute power equation

Definition at line 517 of file cons_abspower.c.

References FALSE, NULL, REALABS, SCIPisEQ(), SCIPisFeasEQ(), sqrt(), and TRUE.

Referenced by presolveFindDuplicates().

static SCIP_RETCODE presolveFindDuplicates	(	SCIP *	scip,
		SCIP_CONSHDLR *	conshdlr,
		SCIP_CONS **	conss,
		int	nconss,
		int *	nupgdconss,
		int *	ndelconss,
		int *	naddconss,
		int *	nfixedvars,
		int *	naggrvars,
		SCIP_Bool *	success,
		SCIP_Bool *	infeas
	)

static

finds and removes duplicates in a set of absolute power constraints

Parameters

scip	SCIP data structure
conshdlr	constraint handler for absolute power constraints
conss	constraints
nconss	number of constraints
nupgdconss	pointer where to add number of upgraded constraints
ndelconss	pointer where to add number of deleted constraints
naddconss	pointer where to add number of added constraints
nfixedvars	pointer where to add number of fixed variables
naggrvars	pointer where to add number of aggregated variables
success	pointer to store whether a duplicate was found (and removed)
infeas	pointer to store whether infeasibility was detected

Definition at line 578 of file cons_abspower.c.

References catchVarEvents(), dropVarEvents(), FALSE, MAX, MIN, NULL, pow(), presolveFindDuplicatesSolveEquations(), presolveFindDuplicatesUpgradeCons(), REALABS, SCIP_Bool, SCIP_CALL, SCIP_MAXSTRLEN, SCIP_OKAY, SCIP_Real, SCIP_VARSTATUS_MULTAGGR, SCIP_VARTYPE_CONTINUOUS, SCIPaddCons(), SCIPaddVar(), SCIPaggregateVars(), SCIPblkmem(), SCIPcalcHashtableSize(), SCIPconsGetData(), SCIPconsGetName(), SCIPconshdlrGetData(), SCIPconsIsActive(), SCIPconsIsChecked(), SCIPconsIsDeleted(), SCIPconsIsDynamic(), SCIPconsIsEnforced(), SCIPconsIsInitial(), SCIPconsIsLocal(), SCIPconsIsModifiable(), SCIPconsIsPropagated(), SCIPconsIsRemovable(), SCIPconsIsSeparated(), SCIPconsIsStickingAtNode(), SCIPcreateConsAbspower(), SCIPcreateConsLinear(), SCIPcreateVar(), SCIPdebugAddSolVal, SCIPdebugGetSolVal, SCIPdebugMessage, SCIPdebugPrintCons, SCIPdelCons(), SCIPfixVar(), SCIPhashtableCreate(), SCIPhashtableFree(), SCIPhashtableInsert(), SCIPhashtableRemove(), SCIPhashtableRetrieveNext(), SCIPinfinity(), SCIPisEQ(), SCIPisGT(), SCIPisInfinity(), SCIPisZero(), SCIPlockVarCons(), SCIPreleaseCons(), SCIPreleaseVar(), SCIPsnprintf(), SCIPunlockVarCons(), SCIPvarGetLbLocal(), SCIPvarGetName(), SCIPvarGetProbvar(), SCIPvarGetStatus(), SCIPvarGetUbLocal(), SIGN, sqrt(), and TRUE.

Referenced by SCIP_DECL_CONSPRESOL().

static SCIP_RETCODE presolveDual	(	SCIP *	scip,
		SCIP_CONS *	cons,
		SCIP_Bool *	cutoff,
		int *	ndelconss,
		int *	nfixedvars
	)

static

fix variables not appearing in any other constraint

Parameters

scip	SCIP data structure
cons	constraint
cutoff	buffer to indicate whether a cutoff was detected
ndelconss	buffer to increase with the number of deleted constraint
nfixedvars	buffer to increase with the number of fixed variables

Definition at line 1094 of file cons_abspower.c.

References MAX, MIN, NULL, SCIP_Bool, SCIP_CALL, SCIP_INVALID, SCIP_OKAY, SCIP_Real, SCIP_VARSTATUS_MULTAGGR, SCIP_VARTYPE_INTEGER, SCIPconsGetData(), SCIPconsGetName(), SCIPconsIsChecked(), SCIPdebugMessage, SCIPdebugPrintCons, SCIPdelCons(), SCIPfixVar(), SCIPinfinity(), SCIPisEQ(), SCIPisFeasGE(), SCIPisFeasLE(), SCIPisGE(), SCIPisGT(), SCIPisInfinity(), SCIPisLE(), SCIPisLT(), SCIPisZero(), SCIPvarGetBestBoundGlobal(), SCIPvarGetLbGlobal(), SCIPvarGetName(), SCIPvarGetNLocksDown(), SCIPvarGetNLocksUp(), SCIPvarGetObj(), SCIPvarGetStatus(), SCIPvarGetType(), SCIPvarGetUbGlobal(), and SIGN.

Referenced by SCIP_DECL_CONSPRESOL().

static SCIP_RETCODE tightenBounds	(	SCIP *	scip,
		SCIP_VAR *	var,
		SCIP_INTERVAL	bounds,
		SCIP_Bool	force,
		SCIP_CONS *	cons,
		SCIP_RESULT *	result,
		int *	nchgbds,
		int *	nfixedvars,
		int *	naddconss
	)

static

given a variable and an interval, tightens the local bounds of this variable to the given interval

Parameters

scip	SCIP data structure
var	variable which bounds to tighten
bounds	new bounds
force	force tightening even if below bound strengthening tolerance
cons	constraint that is propagated
result	pointer to store the result of the propagation call
nchgbds	buffer where to add the number of changed bounds
nfixedvars	buffer where to add the number of fixed variables, can be equal to nchgbds
naddconss	buffer where to add the number of added constraints, can be NULL if force is FALSE

Definition at line 1383 of file cons_abspower.c.

References FALSE, SCIP_Interval::inf, NULL, SCIP_Bool, SCIP_CALL, SCIP_CONSADDED, SCIP_CUTOFF, SCIP_DIDNOTFIND, SCIP_OKAY, SCIP_Real, SCIP_REDUCEDDOM, SCIP_STAGE_SOLVING, SCIPaddCons(), SCIPaddConsLocal(), SCIPconsGetName(), SCIPconsIsChecked(), SCIPconsIsEnforced(), SCIPconsIsInitial(), SCIPconsIsPropagated(), SCIPconsIsSeparated(), SCIPcreateConsLinear(), SCIPdebugMessage, SCIPfixVar(), SCIPgetCurrentNode(), SCIPgetStage(), SCIPinProbing(), SCIPintervalGetInf(), SCIPintervalGetSup(), SCIPisEQ(), SCIPisGT(), SCIPisInfinity(), SCIPisLT(), SCIPnodeGetDepth(), SCIPreleaseCons(), SCIPtightenVarLb(), SCIPtightenVarUb(), SCIPvarGetLbLocal(), SCIPvarGetName(), SCIPvarGetProbvar(), SCIPvarGetUbLocal(), SCIPvarIsActive(), SCIP_Interval::sup, and TRUE.

Referenced by checkFixedVariables(), and propagateCons().

static void computeBoundsZ	(	SCIP *	scip,
		SCIP_CONS *	cons,
		SCIP_INTERVAL	xbnds,
		SCIP_INTERVAL *	zbnds
	)

static

computes bounds on z in a absolute power constraints for given bounds on x

Parameters

scip	SCIP data structure
cons	constraint
xbnds	bounds on x that are to be propagated
zbnds	buffer to store corresponding bounds on z

Definition at line 1537 of file cons_abspower.c.

References SCIP_Interval::inf, NULL, PROPSIDETOL, PROPVARTOL, REALABS, SCIP_Real, SCIPconsGetData(), SCIPdebugMessage, SCIPdebugPrintCons, SCIPinfinity(), SCIPintervalIsEmpty(), SCIPintervalSetEntire(), SCIPisInfinity(), SIGN, and SCIP_Interval::sup.

Referenced by checkFixedVariables(), and propagateCons().

static void computeBoundsX	(	SCIP *	scip,
		SCIP_CONS *	cons,
		SCIP_INTERVAL	zbnds,
		SCIP_INTERVAL *	xbnds
	)

static

computes bounds on x in a absolute power constraints for given bounds on z

Parameters

scip	SCIP data structure
cons	constraint
zbnds	bounds on x that are to be propagated
xbnds	buffer to store corresponding bounds on z

Definition at line 1590 of file cons_abspower.c.

References SCIP_Interval::inf, NULL, pow(), PROPSIDETOL, PROPVARTOL, REALABS, SCIP_Real, SCIPconsGetData(), SCIPdebugMessage, SCIPdebugPrintCons, SCIPinfinity(), SCIPintervalIsEmpty(), SCIPintervalSetEntire(), SCIPisInfinity(), SIGN, sqrt(), and SCIP_Interval::sup.

Referenced by checkFixedVariables(), and propagateCons().

static SCIP_RETCODE checkFixedVariables	(	SCIP *	scip,
		SCIP_CONSHDLR *	conshdlr,
		SCIP_CONS *	cons,
		int *	ndelconss,
		int *	nupgdconss,
		int *	nchgbds,
		int *	nfixedvars,
		SCIP_RESULT *	result
	)

static

checks if x or z is fixed and replaces them or deletes constraint

Parameters

scip	SCIP data structure
conshdlr	constraint handler for absolute power constraints
cons	constraint
ndelconss	counter for number of deleted constraints
nupgdconss	counter for number of upgraded constraints
nchgbds	counter for number of variable bound changes
nfixedvars	counter for number of variable fixations
result	to store result if we detect infeasibility or remove constraint

Definition at line 1643 of file cons_abspower.c.

References catchVarEvents(), computeBoundsX(), computeBoundsZ(), dropVarEvents(), FALSE, SCIP_Interval::inf, MAX, MIN, NULL, pow(), REALABS, SCIP_CALL, SCIP_CUTOFF, SCIP_DIDNOTFIND, SCIP_OKAY, SCIP_Real, SCIP_VARSTATUS_MULTAGGR, SCIPconsGetData(), SCIPconsGetName(), SCIPconshdlrGetData(), SCIPdebugMessage, SCIPdebugPrintCons, SCIPdelCons(), SCIPgetProbvarSum(), SCIPinfinity(), SCIPintervalSet(), SCIPisEQ(), SCIPisFeasEQ(), SCIPisFeasGT(), SCIPisFeasLT(), SCIPisGE(), SCIPisInfinity(), SCIPisLE(), SCIPisZero(), SCIPlockVarCons(), SCIPmarkDoNotMultaggrVar(), SCIPunlockVarCons(), SCIPvarGetLbGlobal(), SCIPvarGetName(), SCIPvarGetStatus(), SCIPvarGetUbGlobal(), SCIPvarIsActive(), SCIPwarningMessage(), SIGN, sqrt(), SCIP_Interval::sup, tightenBounds(), and TRUE.

Referenced by SCIP_DECL_CONSPRESOL().

static SCIP_Real getGradientMaxElement	(	SCIP *	scip,
		SCIP_CONS *	cons,
		SCIP_SOL *	sol
	)

static

gets maximal absolute value in gradient of quadratic function thus, gives $max(n |x+offset|^{n-1}, |zcoef|)$ .

Parameters

scip	SCIP data structure
cons	constraint
sol	solution or NULL if LP solution should be used

Definition at line 1938 of file cons_abspower.c.

References MAX, NULL, pow(), REALABS, SCIP_Real, SCIPconsGetData(), SCIPgetSolVal(), and SCIPisInfinity().

Referenced by computeViolation().

static SCIP_RETCODE computeViolation	(	SCIP *	scip,
		SCIP_CONSHDLR *	conshdlr,
		SCIP_CONS *	cons,
		SCIP_SOL *	sol,
		SCIP_Real *	viol
	)

static

computes violation of a constraint

Parameters

scip	SCIP data structure
conshdlr	constraint handler
cons	constraint
sol	solution or NULL if LP solution should be used
viol	pointer to store absolute (unscaled) constraint violation

Definition at line 1967 of file cons_abspower.c.

References getGradientMaxElement(), MAX, MIN, NULL, REALABS, SCIP_INVALIDDATA, SCIP_OKAY, SCIP_Real, SCIPABORT, SCIPconsGetData(), SCIPconshdlrGetData(), SCIPerrorMessage, SCIPgetSolVal(), SCIPinfinity(), SCIPisFeasGE(), SCIPisFeasLE(), SCIPisInfinity(), SCIPvarGetLbLocal(), SCIPvarGetUbLocal(), and SIGN.

Referenced by computeViolations(), proposeFeasibleSolution(), and SCIP_DECL_CONSCHECK().

static SCIP_RETCODE computeViolations	(	SCIP *	scip,
		SCIP_CONSHDLR *	conshdlr,
		SCIP_CONS **	conss,
		int	nconss,
		SCIP_SOL *	sol,
		SCIP_CONS **	maxviolcon
	)

static

computes violation of a set of constraints

Parameters

scip	SCIP data structure
conshdlr	constraint handler
conss	constraints
nconss	number of constraints
sol	solution or NULL if LP solution should be used
maxviolcon	buffer to store constraint with largest violation, or NULL if solution is feasible

Definition at line 2096 of file cons_abspower.c.

References computeViolation(), MAX, NULL, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIPconsGetData(), SCIPfeastol(), and SCIPisGT().

Referenced by SCIP_DECL_CONSENFOLP(), SCIP_DECL_CONSENFOPS(), SCIP_DECL_CONSSEPALP(), and SCIP_DECL_CONSSEPASOL().

static SCIP_Real proposeBranchingPoint	(	SCIP *	scip,
		SCIP_CONS *	cons,
		int	preferzero,
		SCIP_Bool	branchminconverror
	)

static

proposes branching point for constraint

Parameters

scip	SCIP data structure
cons	constraint which variable to get branching point for
preferzero	how much we prefer branching on -xoffset (0, 1, or 2) if sign is not fixed
branchminconverror	whether to minimize convexification error if sign is fixed

Definition at line 2141 of file cons_abspower.c.

References MAX, MIN, NULL, pow(), SCIP_INVALID, SCIP_Real, SCIPconsGetData(), SCIPfeastol(), SCIPgetVarSol(), SCIPisFeasNegative(), SCIPisFeasPositive(), SCIPisGE(), SCIPisGT(), SCIPisInfinity(), SCIPisLE(), SCIPisLT(), SCIPvarGetLbLocal(), and SCIPvarGetUbLocal().

Referenced by registerBranchingCandidates(), and SCIP_DECL_CONSENFOPS().

static SCIP_RETCODE registerBranchingCandidates	(	SCIP *	scip,
		SCIP_CONSHDLR *	conshdlr,
		SCIP_CONS **	conss,
		int	nconss,
		int *	nnotify
	)

static

registers branching variable candidates registers x for all violated absolute power constraints where x is not in convex region

Parameters

scip	SCIP data structure
conshdlr	constraint handler
conss	constraints to check
nconss	number of constraints to check
nnotify	counter for number of notifications performed

Definition at line 2249 of file cons_abspower.c.

References FALSE, MAX, NULL, proposeBranchingPoint(), SCIP_Bool, SCIP_CALL, SCIP_OKAY, SCIPaddExternBranchCand(), SCIPconsGetData(), SCIPconsGetName(), SCIPconshdlrGetData(), SCIPdebugMessage, SCIPfeastol(), SCIPgetSolVal(), SCIPisGT(), SCIPisInfinity(), SCIPisLT(), SCIPisRelEQ(), SCIPvarGetLbLocal(), SCIPvarGetName(), and SCIPvarGetUbLocal().

Referenced by SCIP_DECL_CONSENFOLP().

static SCIP_RETCODE registerLargeLPValueVariableForBranching	(	SCIP *	scip,
		SCIP_CONS **	conss,
		int	nconss,
		SCIP_VAR **	brvar
	)

static

registers a variable from a violated constraint as branching candidate that has a large absolute value in the LP relaxation

Parameters

scip	SCIP data structure
conss	constraints
nconss	number of constraints
brvar	buffer to store branching variable

Definition at line 2317 of file cons_abspower.c.

References NULL, REALABS, SCIP_CALL, SCIP_INVALID, SCIP_OKAY, SCIP_Real, SCIPaddExternBranchCand(), SCIPconsGetData(), SCIPfeastol(), SCIPgetSolVal(), and SCIPisGT().

Referenced by SCIP_DECL_CONSENFOLP().

static SCIP_RETCODE resolvePropagation	(	SCIP *	scip,
		SCIP_CONS *	cons,
		SCIP_VAR *	infervar,
		PROPRULE	proprule,
		SCIP_BOUNDTYPE	boundtype,
		SCIP_BDCHGIDX *	bdchgidx
	)

static

resolves a propagation on the given variable by supplying the variables needed for applying the corresponding propagation rule (see propagateCons()): see cons_varbound

Parameters

scip	SCIP data structure
cons	constraint that inferred the bound change
infervar	variable that was deduced
proprule	propagation rule that deduced the bound change
boundtype	the type of the changed bound (lower or upper bound)
bdchgidx	bound change index (time stamp of bound change), or NULL for current time

Definition at line 2365 of file cons_abspower.c.

References NULL, PROPRULE_1, PROPRULE_2, PROPRULE_3, PROPRULE_4, PROPRULE_INVALID, SCIP_BOUNDTYPE_LOWER, SCIP_BOUNDTYPE_UPPER, SCIP_CALL, SCIP_INVALIDDATA, SCIP_OKAY, SCIPaddConflictLb(), SCIPaddConflictUb(), SCIPconsGetData(), SCIPconsGetName(), SCIPerrorMessage, and SCIPisInfinity().

Referenced by analyzeConflict(), and SCIP_DECL_CONSRESPROP().

static SCIP_RETCODE analyzeConflict	(	SCIP *	scip,
		SCIP_CONS *	cons,
		SCIP_VAR *	infervar,
		PROPRULE	proprule,
		SCIP_BOUNDTYPE	boundtype
	)

static

analyze infeasibility

Parameters

scip	SCIP data structure
cons	variable bound constraint
infervar	variable that was deduced
proprule	propagation rule that deduced the bound change
boundtype	the type of the changed bound (lower or upper bound)

Definition at line 2441 of file cons_abspower.c.

References NULL, resolvePropagation(), SCIP_BOUNDTYPE_LOWER, SCIP_BOUNDTYPE_UPPER, SCIP_CALL, SCIP_OKAY, SCIP_STAGE_SOLVING, SCIPaddConflictLb(), SCIPaddConflictUb(), SCIPanalyzeConflictCons(), SCIPgetStage(), SCIPinitConflictAnalysis(), SCIPinProbing(), and SCIPisConflictAnalysisApplicable().

Referenced by propagateCons().

static SCIP_RETCODE propagateCons	(	SCIP *	scip,
		SCIP_CONSHDLR *	conshdlr,
		SCIP_CONS *	cons,
		SCIP_Bool	canaddcons,
		SCIP_Bool *	cutoff,
		int *	nchgbds,
		int *	naddconss
	)

static

propagation method for absolute power constraint SCIPinferVarXbCons to allow for repropagation

Parameters

scip	SCIP data structure
conshdlr	constraint handler
cons	variable bound constraint
canaddcons	are we allowed to add a linear constraint when enforcing bounds for a multiaggregated variable?
cutoff	pointer to store whether the node can be cut off
nchgbds	pointer to count number of bound changes
naddconss	pointer to count number of added constraints

Definition at line 2480 of file cons_abspower.c.

References analyzeConflict(), computeBoundsX(), computeBoundsZ(), FALSE, MAX, MIN, NULL, pow(), PROPRULE_1, PROPRULE_2, PROPRULE_3, PROPRULE_4, PROPSIDETOL, PROPVARTOL, REALABS, SCIP_Bool, SCIP_BOUNDTYPE_LOWER, SCIP_BOUNDTYPE_UPPER, SCIP_CALL, SCIP_CUTOFF, SCIP_OKAY, SCIP_Real, SCIP_VARSTATUS_MULTAGGR, SCIPconsGetData(), SCIPconsGetName(), SCIPdebugMessage, SCIPdelConsLocal(), SCIPinferVarLbCons(), SCIPinferVarUbCons(), SCIPinfinity(), SCIPintervalSetBounds(), SCIPisFeasEQ(), SCIPisFeasGE(), SCIPisFeasGT(), SCIPisFeasLE(), SCIPisFeasLT(), SCIPisGT(), SCIPisInfinity(), SCIPisLbBetter(), SCIPisLT(), SCIPisRelEQ(), SCIPisUbBetter(), SCIPvarGetLbLocal(), SCIPvarGetName(), SCIPvarGetProbvar(), SCIPvarGetStatus(), SCIPvarGetUbLocal(), SCIPvarIsActive(), SIGN, sqrt(), tightenBounds(), and TRUE.

Referenced by SCIP_DECL_CONSENFOLP(), SCIP_DECL_CONSENFOPS(), SCIP_DECL_CONSPRESOL(), and SCIP_DECL_CONSPROP().

static SCIP_RETCODE addVarbound	(	SCIP *	scip,
		SCIP_CONS *	cons,
		SCIP_Bool	addcons,
		SCIP_VAR *	var,
		SCIP_VAR *	vbdvar,
		SCIP_Real	vbdcoef,
		SCIP_Real	lhs,
		SCIP_Real	rhs,
		SCIP_Bool *	infeas,
		int *	nbdchgs,
		int *	naddconss
	)

static

notifies SCIP about a variable bound lhs <= x + c*y <= rhs

Parameters

scip	SCIP data structure
cons	absolute power constraint this variable bound is derived form
addcons	should the variable bound be added as constraint to SCIP?
var	variable x for which we want to add a variable bound
vbdvar	variable y which makes the bound a variable bound
vbdcoef	coefficient c of bounding variable vbdvar
lhs	left hand side of varbound constraint
rhs	right hand side of varbound constraint
infeas	pointer to store whether an infeasibility was detected
nbdchgs	pointer where to add number of performed bound changes
naddconss	pointer where to add number of added constraints

Definition at line 3085 of file cons_abspower.c.

References FALSE, NULL, SCIP_CALL, SCIP_MAXSTRLEN, SCIP_OKAY, SCIP_Real, SCIP_VARSTATUS_MULTAGGR, SCIPaddCons(), SCIPaddVarVlb(), SCIPaddVarVub(), SCIPconsGetName(), SCIPcreateConsVarbound(), SCIPdebugMessage, SCIPgetProbvarSum(), SCIPisEQ(), SCIPisInfinity(), SCIPisZero(), SCIPreleaseCons(), SCIPsnprintf(), SCIPvarGetLbGlobal(), SCIPvarGetName(), SCIPvarGetStatus(), SCIPvarGetUbGlobal(), SCIPvarIsActive(), SCIPvarIsIntegral(), and TRUE.

Referenced by propagateVarbounds().

static SCIP_RETCODE propagateVarbounds	(	SCIP *	scip,
		SCIP_CONSHDLR *	conshdlr,
		SCIP_CONS *	cons,
		SCIP_Bool *	infeas,
		int *	nbdchgs,
		int *	naddconss
	)

static

propagates varbounds of variables Let f(x) = sign(x+offset)|x+offset|^n, f^{-1}(y) = sign(y)|y|^(1/n) - offset. Thus, constraint is lhs <= f(x) + c*z <= rhs.

Given a variable bound constraint x <= a*y + b with y a binary variable, one obtains y = 0 -> f(x) <= f(b) -> lhs <= f(b) + c*z y = 1 -> f(x) <= f(a+b) -> lhs <= f(a+b) + c*z => lhs <= f(b) + y * (f(a+b)-f(b)) + c*z

Given a variable bound constraint x >= a*y + b with y a binary variable, one obtains analogously f(b) + y * (f(a+b)-f(b)) + c*z <= rhs

Given a variable bound constraint c*z <= a*y + b with y a binary variable, one obtains y = 0 -> lhs <= f(x) + b -> x >= f^{-1}(lhs - b) y = 1 -> lhs <= f(x) + a+b -> x >= f^{-1}(lhs - (a+b)) => x >= f^{-1}(lhs - b) + y * (f^{-1}(lhs - (a+b)) - f^{-1}(lhs - b))

Given a variable bound constraint c*z >= a*y + b with y a binary variable, one obtains analogously x <= f^{-1}(rhs - b) + y * (f^{-1}(rhs - (a+b)) - f^{-1}(rhs - b))

Parameters

scip	SCIP data structure
conshdlr	constraint handler
cons	absolute power constraint
infeas	pointer to store whether an infeasibility was detected
nbdchgs	pointer where to add number of performed bound changes
naddconss	pointer where to add number of added constraints

Definition at line 3192 of file cons_abspower.c.

References addVarbound(), FALSE, NULL, pow(), SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIPconsGetData(), SCIPconshdlrGetData(), SCIPdebugMessage, SCIPinfinity(), SCIPisFeasZero(), SCIPisInfinity(), SCIPisZero(), SCIPvarGetLbGlobal(), SCIPvarGetName(), SCIPvarGetNVlbs(), SCIPvarGetNVubs(), SCIPvarGetUbGlobal(), SCIPvarGetVlbCoefs(), SCIPvarGetVlbConstants(), SCIPvarGetVlbVars(), SCIPvarGetVubCoefs(), SCIPvarGetVubConstants(), SCIPvarGetVubVars(), SCIPvarIsBinary(), and SIGN.

Referenced by SCIP_DECL_CONSPRESOL().

static SCIP_RETCODE generateLinearizationCut	(	SCIP *	scip,
		SCIP_ROW **	row,
		SCIP_CONSHDLR *	conshdlr,
		SCIP_Real	refpoint,
		SCIP_Real	exponent,
		SCIP_Real	xoffset,
		SCIP_Real	xmult,
		SCIP_Real	zcoef,
		SCIP_Real	rhs,
		SCIP_VAR *	x,
		SCIP_VAR *	z,
		SCIP_Bool	islocal
	)

static

computes linear underestimator for (x+offset)^n + c*z <= rhs by linearization in x

the generated cut is xmul * n * (refpoint+offset)^(n-1) * x + c*z <= rhs + ((n-1)*refpoint-offset) * (refpoint+offset)^(n-1)

Parameters

scip	SCIP data structure
row	buffer to store row
conshdlr	constraint handler
refpoint	base point for linearization
exponent	exponent n in sign(x)abs(x)^n
xoffset	offset of x
xmult	multiplier for coefficient of x
zcoef	coefficient of z
rhs	right hand side
x	variable x
z	variable z
islocal	whether the cut is valid only locally

Definition at line 3410 of file cons_abspower.c.

References FALSE, NULL, pow(), SCIP_CALL, SCIP_MAXSTRLEN, SCIP_OKAY, SCIP_Real, SCIPaddVarToRow(), SCIPconshdlrGetData(), SCIPcreateEmptyRowCons(), SCIPdebugMessage, SCIPinfinity(), SCIPisFeasNegative(), SCIPisInfinity(), SCIPsnprintf(), and TRUE.

Referenced by generateCut(), generateLinearizationCutProject(), and SCIP_DECL_CONSINITLP().

static SCIP_RETCODE generateLinearizationCutProject	(	SCIP *	scip,
		SCIP_ROW **	row,
		SCIP_CONSHDLR *	conshdlr,
		SCIP_Real	xref,
		SCIP_Real	zref,
		SCIP_Real	xmin,
		SCIP_Real	exponent,
		SCIP_Real	xoffset,
		SCIP_Real	xmult,
		SCIP_Real	zcoef,
		SCIP_Real	rhs,
		SCIP_VAR *	x,
		SCIP_VAR *	z,
		SCIP_Bool	islocal
	)

static

computes linear underestimator for (x+xoffset)^n + c*z <= rhs by linearization in x

the generated cut is xmul * n * (refpoint+offset)^(n-1) * x + c*z <= rhs + ((n-1)*refpoint-offset) * (refpoint+offset)^(n-1) where refpoint is computed by projecting (xref, zref) onto the graph of (x+offset)^n w.r.t. euclidean norm

Thus, the projection is computed by minimizing 1/2(x-xref)^2 + 1/2(((x+offset)^n-rhs)/(-c) - zref)^2. I.e., we aim to find a root of g(x) = x - xref + n/c (x+offset)^(n-1) (zref - rhs/c) + n/c^2 (x+offset)^(2n-1) We do this numerically by executing up to five newton iterations. It is g'(x) = 1 + n(n-1)/c (x+offset)^(n-2) (zref - rhs/c) + n(2n-1)/c^2 (x+offset)^(2n-2)

Parameters

scip	SCIP data structure
row	buffer to store row
conshdlr	constraint handler
xref	reference point for x
zref	reference point for z
xmin	minimal value x is allowed to take
exponent	exponent n in sign(x+offset)abs(x+offset)^n
xoffset	offset of x
xmult	multiplier for coefficient of x
zcoef	coefficient of z
rhs	right hand side
x	variable x
z	variable z
islocal	whether the cut is valid only locally

Definition at line 3479 of file cons_abspower.c.

References generateLinearizationCut(), NULL, pow(), SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIPisFeasNegative(), SCIPisFeasPositive(), and SCIPisInfinity().

Referenced by generateCut().

static SCIP_RETCODE generateSecantCut	(	SCIP *	scip,
		SCIP_ROW **	row,
		SCIP_CONSHDLR *	conshdlr,
		SCIP_SOL *	sol,
		SCIP_Real	xlb,
		SCIP_Real	xub,
		SCIP_Real	exponent,
		SCIP_Real	xoffset,
		DECL_MYPOW((*mypow))	,
		SCIP_Real	xmult,
		SCIP_Real	zcoef,
		SCIP_Real	rhs,
		SCIP_VAR *	x,
		SCIP_VAR *	z
	)

static

computes secant underestimator for sign(x+offset)abs(x+offset)^n + c*z <= rhs

the generated cut is slope*xmult*x + c*z <= rhs + (-xlb-offset)^n + slope*xlb, where slope = (sign(xub+offset)*abs(xub+offset)^n + (-xlb-offset)^n) / (xub - xlb).

the cut is not generated if the given solution (or the LP solution) would not be cutoff

Parameters

scip	SCIP data structure
row	buffer to store row
conshdlr	constraint handler
sol	point we want to cut off, or NULL for LP solution
xlb	lower bound of x
xub	upper bound of x
exponent	exponent n in sign(x+offset)abs(x+offset)^n
xoffset	offset of x
xmult	multiplier for coefficient of x
zcoef	coefficient of z
rhs	right hand side
x	variable x
z	variable z

Definition at line 3554 of file cons_abspower.c.

References FALSE, NULL, REALABS, SCIP_CALL, SCIP_MAXSTRLEN, SCIP_OKAY, SCIP_Real, SCIPaddVarToRow(), SCIPchgRowRhs(), SCIPconshdlrGetData(), SCIPcreateEmptyRowCons(), SCIPgetCurrentNode(), SCIPgetSolVal(), SCIPinfinity(), SCIPisFeasPositive(), SCIPisInfinity(), SCIPisLE(), SCIPisPositive(), SCIPisRelEQ(), SCIPnodeGetDepth(), SCIPsnprintf(), SIGN, and TRUE.

Referenced by generateCut().

static SCIP_RETCODE generateSecantCutNoCheck	(	SCIP *	scip,
		SCIP_ROW **	row,
		SCIP_CONSHDLR *	conshdlr,
		SCIP_Real	xlb,
		SCIP_Real	xub,
		SCIP_Real	exponent,
		SCIP_Real	xoffset,
		DECL_MYPOW((*mypow))	,
		SCIP_Real	xmult,
		SCIP_Real	zcoef,
		SCIP_Real	rhs,
		SCIP_VAR *	x,
		SCIP_VAR *	z
	)

static

computes secant underestimator for sign(x+xoffset)abs(x+xoffset)^n + c*z <= rhs

The generated cut is slope*xmult*x + c*z <= rhs + (-xlb-xoffset)^n + slope*xlb, where slope = (sign(xub+xoffset)*abs(xub+xoffset)^n + (-xlb-xoffset)^n) / (xub - xlb).

Parameters

scip	SCIP data structure
row	buffer to store row
conshdlr	constraint handler
xlb	lower bound of x
xub	upper bound of x
exponent	exponent n in sign(x)abs(x)^n
xoffset	offset of x
xmult	multiplier for coefficient of x
zcoef	coefficient of z
rhs	right hand side
x	variable x
z	variable z

Definition at line 3618 of file cons_abspower.c.

References FALSE, NULL, REALABS, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIPaddVarToRow(), SCIPchgRowRhs(), SCIPcreateEmptyRowCons(), SCIPgetCurrentNode(), SCIPinfinity(), SCIPisInfinity(), SCIPisLE(), SCIPisPositive(), SCIPisRelEQ(), SCIPnodeGetDepth(), SIGN, and TRUE.

Referenced by SCIP_DECL_CONSINITLP().

static SCIP_RETCODE generateCut	(	SCIP *	scip,
		SCIP_CONS *	cons,
		SCIP_SOL *	sol,
		SCIP_ROW **	row,
		SCIP_Bool	onlyinbounds
	)

static

generates a cut based on Liberti and Pantelides, Convex Envelopes of Monomials of Odd Degree, J. Global Optimization 25, 157-168, 2003, and previous publications

Parameters

scip	SCIP data structure
cons	constraint
sol	solution to separate, or NULL if LP solution should be used
row	storage for cut
onlyinbounds	whether linearization is allowed only in variable bounds

Definition at line 3667 of file cons_abspower.c.

References generateLinearizationCut(), generateLinearizationCutProject(), generateSecantCut(), NULL, REALABS, SCIP_Bool, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIP_SIDETYPE_LEFT, SCIP_SIDETYPE_RIGHT, SCIPconsGetData(), SCIPconsGetHdlr(), SCIPconsGetName(), SCIPconshdlrGetData(), SCIPconsIsGlobal(), SCIPdebug, SCIPdebugMessage, SCIPdebugPrintCons, SCIPfeastol(), SCIPgetCurrentNode(), SCIPgetRowMaxCoef(), SCIPgetRowMinCoef(), SCIPgetSolVal(), SCIPisGT(), SCIPisInfinity(), SCIPisNegative(), SCIPisPositive(), SCIPnodeGetDepth(), SCIPprintRow(), SCIPreleaseRow(), SCIProwGetRhs(), SCIPvarGetLbGlobal(), SCIPvarGetLbLocal(), SCIPvarGetUbGlobal(), and SCIPvarGetUbLocal().

Referenced by addLinearizationCuts(), and separatePoint().

static SCIP_RETCODE separatePoint	(	SCIP *	scip,
		SCIP_CONSHDLR *	conshdlr,
		SCIP_CONS **	conss,
		int	nconss,
		int	nusefulconss,
		SCIP_SOL *	sol,
		SCIP_Real	minefficacy,
		SCIP_Bool	inenforcement,
		SCIP_Bool	onlyinbounds,
		SCIP_Bool *	success,
		SCIP_Bool *	cutoff,
		SCIP_Real *	bestefficacy
	)

static

tries to separate solution or LP solution by a linear cut assumes that constraint violations have been computed

Parameters

scip	SCIP data structure
conshdlr	quadratic constraints handler
conss	constraints
nconss	number of constraints
nusefulconss	number of constraints that seem to be useful
sol	solution to separate, or NULL if LP solution should be used
minefficacy	minimal efficacy of a cut if it should be added to the LP
inenforcement	whether we are in constraint enforcement
onlyinbounds	whether linearization is allowed only in variable bounds
success	result of separation: separated point (TRUE) or not (FALSE)
cutoff	whether a cutoff has been detected
bestefficacy	buffer to store best efficacy of a cut that was added to the LP, if found; or NULL if not of interest

Definition at line 3826 of file cons_abspower.c.

References FALSE, generateCut(), MAX, MIN, NULL, REALABS, SCIP_Bool, SCIP_CALL, SCIP_INVALIDDATA, SCIP_OKAY, SCIP_Real, SCIPABORT, SCIPaddCut(), SCIPaddRowIndicator(), SCIPconsGetData(), SCIPconshdlrGetData(), SCIPerrorMessage, SCIPfeastol(), SCIPgetRelaxFeastolFactor(), SCIPgetRowMaxCoef(), SCIPgetRowSolFeasibility(), SCIPgetSolVal(), SCIPisCutApplicable(), SCIPisFeasPositive(), SCIPisGT(), SCIPisInfinity(), SCIPisNegative(), SCIPisPositive(), SCIPmarkRowNotRemovableLocal(), SCIPreleaseRow(), SCIProwGetLhs(), SCIProwGetRhs(), SCIProwIsLocal(), SCIPvarGetLbLocal(), SCIPvarGetUbLocal(), and TRUE.

Referenced by SCIP_DECL_CONSENFOLP(), SCIP_DECL_CONSSEPALP(), and SCIP_DECL_CONSSEPASOL().

static SCIP_RETCODE addLinearizationCuts	(	SCIP *	scip,
		SCIP_CONSHDLR *	conshdlr,
		SCIP_CONS **	conss,
		int	nconss,
		SCIP_SOL *	ref,
		SCIP_Bool *	separatedlpsol,
		SCIP_Real	minefficacy
	)

static

adds linearizations cuts for convex constraints w.r.t. a given reference point to cutpool and sepastore if separatedlpsol is not NULL, then a cut that separates the LP solution is added to the sepastore and is forced to enter the LP if separatedlpsol is not NULL, but cut does not separate the LP solution, then it is added to the cutpool only if separatedlpsol is NULL, then cut is added to cutpool only

Parameters

scip	SCIP data structure
conshdlr	quadratic constraints handler
conss	constraints
nconss	number of constraints
ref	reference point where to linearize, or NULL for LP solution
separatedlpsol	buffer to store whether a cut that separates the current LP solution was found and added to LP, or NULL if adding to cutpool only
minefficacy	minimal efficacy of a cut when checking for separation of LP solution

Definition at line 3972 of file cons_abspower.c.

References FALSE, generateCut(), MAX, MIN, NULL, REALABS, SCIP_Bool, SCIP_CALL, SCIP_INVALIDDATA, SCIP_OKAY, SCIP_Real, SCIPABORT, SCIPaddCut(), SCIPaddPoolCut(), SCIPconsGetData(), SCIPconshdlrGetData(), SCIPconsIsLocal(), SCIPerrorMessage, SCIPgetRowLPFeasibility(), SCIPgetRowMaxCoef(), SCIPisGT(), SCIPisInfinity(), SCIPisLT(), SCIPreleaseRow(), SCIProwGetLhs(), SCIProwGetRhs(), SCIProwIsLocal(), SCIPvarGetLbGlobal(), SCIPvarGetUbGlobal(), and TRUE.

Referenced by SCIP_DECL_CONSSEPALP(), and SCIP_DECL_EVENTEXEC().

static SCIP_DECL_EVENTEXEC ( processNewSolutionEvent )

static

processes the event that a new primal solution has been found

Definition at line 4096 of file cons_abspower.c.

References addLinearizationCuts(), NULL, SCIP_CALL, SCIP_EVENTTYPE_SOLFOUND, SCIP_OKAY, SCIPconshdlrGetConss(), SCIPconshdlrGetData(), SCIPconshdlrGetNConss(), SCIPdebugMessage, SCIPeventGetSol(), SCIPeventGetType(), SCIPheurGetName(), and SCIPsolGetHeur().

static SCIP_RETCODE proposeFeasibleSolution	(	SCIP *	scip,
		SCIP_CONSHDLR *	conshdlr,
		SCIP_CONS **	conss,
		int	nconss,
		SCIP_SOL *	sol
	)

static

given a solution, try to make absolute power constraints feasible by shifting the linear variable z and pass this solution to the trysol heuristic

Parameters

scip	SCIP data structure
conshdlr	constraint handler
conss	constraints to process
nconss	number of constraints
sol	solution to process

Definition at line 4143 of file cons_abspower.c.

References computeViolation(), MAX, NULL, REALABS, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIP_VARSTATUS_MULTAGGR, SCIPconsGetData(), SCIPconshdlrGetData(), SCIPcreateLPSol(), SCIPcreateSolCopy(), SCIPdebugMessage, SCIPfeastol(), SCIPfreeSol(), SCIPgetSolTransObj(), SCIPgetSolVal(), SCIPheurPassSolTrySol(), SCIPisFeasGT(), SCIPisFeasLT(), SCIPisGT(), SCIPisInfinity(), SCIPsetSolVal(), SCIPunlinkSol(), SCIPvarGetLbGlobal(), SCIPvarGetStatus(), SCIPvarGetUbGlobal(), and SIGN.

Referenced by SCIP_DECL_CONSCHECK().

static SCIP_RETCODE createNlRow	(	SCIP *	scip,
		SCIP_CONS *	cons
	)

static

create a nonlinear row representation of the constraint and stores them in consdata

Parameters

scip	SCIP data structure
cons	absolute power constraint

Definition at line 4245 of file cons_abspower.c.

References SCIP_QuadElement::coef, SCIP_QuadElement::idx1, SCIP_QuadElement::idx2, NULL, SCIP_Bool, SCIP_CALL, SCIP_EXPR_CONST, SCIP_EXPR_INTPOWER, SCIP_EXPR_MUL, SCIP_EXPR_PLUS, SCIP_EXPR_REALPOWER, SCIP_EXPR_SIGNPOWER, SCIP_EXPR_VARIDX, SCIP_OKAY, SCIP_Real, SCIPblkmem(), SCIPconsGetData(), SCIPconsGetName(), SCIPcreateNlRow(), SCIPexprCreate(), SCIPexprtreeCreate(), SCIPexprtreeFree(), SCIPexprtreeSetVars(), SCIPisIntegral(), SCIPisNegative(), SCIPisPositive(), SCIPreleaseNlRow(), SCIPround(), SCIPvarGetLbGlobal(), SCIPvarGetUbGlobal(), and sign().

Referenced by SCIP_DECL_CONSINITSOL(), and SCIPgetNlRowAbspower().

static SCIP_DECL_QUADCONSUPGD ( quadconsUpgdAbspower )

static

upgrades a quadratic constraint where the quadratic part is only a single square term and the quadratic variable sign is fixed to a signpower constraint

Definition at line 4399 of file cons_abspower.c.

References SCIP_QuadVarTerm::lincoef, NULL, SCIP_CALL, SCIP_MAXSTRLEN, SCIP_OKAY, SCIP_Real, SCIP_VARTYPE_CONTINUOUS, SCIPaddCoefLinear(), SCIPaddVar(), SCIPconsGetName(), SCIPconsIsChecked(), SCIPconsIsDynamic(), SCIPconsIsEnforced(), SCIPconsIsInitial(), SCIPconsIsLocal(), SCIPconsIsModifiable(), SCIPconsIsPropagated(), SCIPconsIsRemovable(), SCIPconsIsSeparated(), SCIPconsIsStickingAtNode(), SCIPcreateConsAbspower(), SCIPcreateConsLinear(), SCIPcreateVar(), SCIPdebugAddSolVal, SCIPdebugGetSolVal, SCIPdebugMessage, SCIPdebugPrintCons, SCIPgetCoefsLinearVarsQuadratic(), SCIPgetLhsQuadratic(), SCIPgetLinearVarsQuadratic(), SCIPgetNBilinTermsQuadratic(), SCIPgetNLinearVarsQuadratic(), SCIPgetNQuadVarTermsQuadratic(), SCIPgetQuadVarTermsQuadratic(), SCIPgetRhsQuadratic(), SCIPinfinity(), SCIPisInfinity(), SCIPisNegative(), SCIPisPositive(), SCIPisZero(), SCIPreleaseVar(), SCIPsnprintf(), SCIPvarGetLbGlobal(), SCIPvarGetUbGlobal(), SCIP_QuadVarTerm::sqrcoef, TRUE, and SCIP_QuadVarTerm::var.

static SCIP_DECL_NONLINCONSUPGD ( nonlinconsUpgdAbspower )

static

tries to upgrade a nonlinear constraint into a absolute power constraint

Definition at line 4553 of file cons_abspower.c.

static SCIP_DECL_EXPRGRAPHNODEREFORM ( exprgraphnodeReformAbspower )

static

tries to reformulate a expression graph node via introducing a absolute power constraint if node fits to absolute power and has indefinte curvature and has no nonlinear parents and has siblings, then replace by auxvar and absolute power constraint if it still has nonlinear parents, then we wait to see if reformulation code move node into auxiliary constraint, so we do not add unnessary auxiliary variables for something like an x^2 in an exp(x^2) if it has no siblings, then we let the upgrading for nonlinear constraints take care of it, since it may be able to upgrade the constraint as a whole and can take the constraint sides into account too (may need only <=/>= auxcons)

Definition at line 4906 of file cons_abspower.c.

static SCIP_DECL_CONSHDLRCOPY ( conshdlrCopyAbspower )

static

copy method for constraint handler plugins (called when SCIP copies plugins)

Definition at line 5169 of file cons_abspower.c.

References CONSHDLR_NAME, NULL, SCIP_CALL, SCIP_OKAY, SCIPconshdlrGetName(), SCIPincludeConshdlrAbspower(), and TRUE.

static SCIP_DECL_CONSFREE ( consFreeAbspower )

static

destructor of constraint handler to free constraint handler data (called when SCIP is exiting)

Definition at line 5185 of file cons_abspower.c.

References NULL, SCIP_OKAY, SCIPconshdlrGetData(), and SCIPfreeMemory.

static SCIP_DECL_CONSINIT ( consInitAbspower )

static

initialization method of constraint handler (called after problem was transformed)

Definition at line 5202 of file cons_abspower.c.

References NULL, SCIP_OKAY, SCIPconshdlrGetData(), SCIPfindConshdlr(), and SCIPfindHeur().

static SCIP_DECL_CONSEXIT ( consExitAbspower )

static

deinitialization method of constraint handler (called before transformed problem is freed)

Definition at line 5223 of file cons_abspower.c.

References NULL, SCIP_OKAY, and SCIPconshdlrGetData().

static SCIP_DECL_CONSINITPRE ( consInitpreAbspower )

static

presolving initialization method of constraint handler (called when presolving is about to begin)

Definition at line 5242 of file cons_abspower.c.

References NULL, SCIP_OKAY, and SCIPconshdlrGetData().

static SCIP_DECL_CONSEXITPRE ( consExitpreAbspower )

static

presolving deinitialization method of constraint handler (called after presolving has been finished)

Definition at line 5259 of file cons_abspower.c.

References NULL, SCIP_OKAY, SCIPconsIsAdded(), and SCIPenableNLP().

static SCIP_DECL_CONSINITSOL ( consInitsolAbspower )

static

solving process initialization method of constraint handler (called when branch and bound process is about to begin)

Definition at line 5283 of file cons_abspower.c.

References CONSHDLR_NAME, createNlRow(), FALSE, NULL, pow(), roots, ROOTS_KNOWN, SCIP_CALL, SCIP_ERROR, SCIP_EVENTTYPE_SOLFOUND, SCIP_OKAY, SCIP_Real, SCIPaddNlRow(), SCIPcatchEvent(), SCIPconsGetData(), SCIPconshdlrGetData(), SCIPconsIsEnabled(), SCIPdebugMessage, SCIPerrorMessage, SCIPfindEventhdlr(), SCIPfloor(), SCIPisEQ(), SCIPisIntegral(), SCIPisNLPConstructed(), and SCIPisZero().

static SCIP_DECL_CONSEXITSOL ( consExitsolAbspower )

static

solving process deinitialization method of constraint handler (called before branch and bound process data is freed)

Definition at line 5391 of file cons_abspower.c.

References CONSHDLR_NAME, NULL, SCIP_CALL, SCIP_EVENTTYPE_SOLFOUND, SCIP_OKAY, SCIPconsGetData(), SCIPconshdlrGetData(), SCIPdropEvent(), SCIPfindEventhdlr(), and SCIPreleaseNlRow().

static SCIP_DECL_CONSDELETE ( consDeleteAbspower )

static

frees specific constraint data

Definition at line 5433 of file cons_abspower.c.

References NULL, SCIP_CALL, SCIP_OKAY, SCIPfreeMemory, and SCIPreleaseNlRow().

static SCIP_DECL_CONSTRANS ( consTransAbspower )

static

transforms constraint data into data belonging to the transformed problem

Definition at line 5456 of file cons_abspower.c.

References NULL, SCIP_CALL, SCIP_OKAY, SCIPconsGetData(), SCIPconsGetName(), SCIPconsIsChecked(), SCIPconsIsDynamic(), SCIPconsIsEnforced(), SCIPconsIsInitial(), SCIPconsIsLocal(), SCIPconsIsModifiable(), SCIPconsIsPropagated(), SCIPconsIsRemovable(), SCIPconsIsSeparated(), SCIPconsIsStickingAtNode(), SCIPcreateCons(), SCIPduplicateMemory, SCIPgetTransformedVar(), SCIPmarkDoNotMultaggrVar(), and SCIPvarIsActive().

static SCIP_DECL_CONSINITLP ( consInitlpAbspower )

static

LP initialization method of constraint handler (called before the initial LP relaxation at a node is solved)

we add secant underestimators

Definition at line 5494 of file cons_abspower.c.

References FALSE, generateLinearizationCut(), generateSecantCutNoCheck(), INITLPMAXVARVAL, MIN, NULL, SCIP_Bool, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIPaddCut(), SCIPaddRowIndicator(), SCIPconsGetData(), SCIPconshdlrGetData(), SCIPgetRowMaxCoef(), SCIPgetRowMinCoef(), SCIPisInfinity(), SCIPisNegative(), SCIPisPositive(), SCIPisRelEQ(), SCIPreleaseRow(), SCIProwGetRhs(), SCIProwIsLocal(), SCIPvarGetLbGlobal(), and SCIPvarGetUbGlobal().

static SCIP_DECL_CONSSEPALP ( consSepalpAbspower )

static

separation method of constraint handler for LP solutions

Definition at line 5664 of file cons_abspower.c.

References addLinearizationCuts(), computeViolations(), FALSE, NULL, SCIP_Bool, SCIP_CALL, SCIP_CUTOFF, SCIP_DIDNOTFIND, SCIP_LPSOLSTAT_OPTIMAL, SCIP_LPSOLSTAT_UNBOUNDEDRAY, SCIP_NLPSOLSTAT_FEASIBLE, SCIP_NLPSOLSTAT_GLOBINFEASIBLE, SCIP_NLPSOLSTAT_UNKNOWN, SCIP_OKAY, SCIP_SEPARATED, SCIPaddLinearConsToNlpHeurSubNlp(), SCIPconsGetData(), SCIPconshdlrGetData(), SCIPcreateNLPSol(), SCIPdebugMessage, SCIPfeastol(), SCIPfreeSol(), SCIPgetDepth(), SCIPgetLPSolstat(), SCIPgetNBinVars(), SCIPgetNContVars(), SCIPgetNIntVars(), SCIPgetNLPFracVars(), SCIPgetNLPSolstat(), SCIPgetNNlpis(), SCIPgetNVars(), SCIPheurPassSolTrySol(), SCIPisGT(), SCIPisInfinity(), SCIPisLT(), SCIPisNLPConstructed(), SCIPsetNLPInitialGuessSol(), SCIPsolveNLP(), SCIPvarGetLbGlobal(), SCIPvarGetUbGlobal(), separatePoint(), and TRUE.

static SCIP_DECL_CONSSEPASOL ( consSepasolAbspower )

static

separation method of constraint handler for arbitrary primal solutions

Definition at line 5812 of file cons_abspower.c.

References computeViolations(), FALSE, NULL, SCIP_Bool, SCIP_CALL, SCIP_CUTOFF, SCIP_DIDNOTFIND, SCIP_OKAY, SCIP_SEPARATED, SCIPconshdlrGetData(), and separatePoint().

static SCIP_DECL_CONSENFOLP ( consEnfolpAbspower )

static

constraint enforcing method of constraint handler for LP solutions

Definition at line 5845 of file cons_abspower.c.

References computeViolations(), FALSE, MAX, MIN, NULL, propagateCons(), registerBranchingCandidates(), registerLargeLPValueVariableForBranching(), SCIP_Bool, SCIP_BRANCHED, SCIP_CALL, SCIP_CONSADDED, SCIP_CUTOFF, SCIP_FEASIBLE, SCIP_INFEASIBLE, SCIP_OKAY, SCIP_Real, SCIP_REDUCEDDOM, SCIP_SEPARATED, SCIPconsGetData(), SCIPconsGetName(), SCIPconshdlrGetData(), SCIPcreateChild(), SCIPdebugMessage, SCIPepsilon(), SCIPfeastol(), SCIPgetCurrentNode(), SCIPgetRelaxFeastolFactor(), SCIPgetSolVal(), SCIPisGT(), SCIPisStopped(), SCIPnodeGetEstimate(), SCIPvarGetName(), SCIPwarningMessage(), separatePoint(), and TRUE.

static SCIP_DECL_CONSENFOPS ( consEnfopsAbspower )

static

constraint enforcing method of constraint handler for pseudo solutions

Definition at line 6014 of file cons_abspower.c.

References computeViolations(), NULL, propagateCons(), proposeBranchingPoint(), SCIP_Bool, SCIP_CALL, SCIP_CONSADDED, SCIP_CUTOFF, SCIP_FEASIBLE, SCIP_INFEASIBLE, SCIP_OKAY, SCIP_REDUCEDDOM, SCIP_SOLVELP, SCIPaddExternBranchCand(), SCIPconsGetData(), SCIPconsGetName(), SCIPconshdlrGetData(), SCIPdebugMessage, SCIPfeastol(), SCIPisGT(), SCIPisRelEQ(), SCIPvarGetLbLocal(), SCIPvarGetUbLocal(), and TRUE.

static SCIP_DECL_CONSPROP ( consPropAbspower )

static

domain propagation method of constraint handler

Definition at line 6105 of file cons_abspower.c.

References FALSE, NULL, propagateCons(), SCIP_Bool, SCIP_CALL, SCIP_CUTOFF, SCIP_DIDNOTFIND, SCIP_OKAY, and SCIP_REDUCEDDOM.

static SCIP_DECL_CONSPRESOL ( consPresolAbspower )

static

presolving method of constraint handler

Definition at line 6147 of file cons_abspower.c.

References checkFixedVariables(), NULL, presolveDual(), presolveFindDuplicates(), propagateCons(), propagateVarbounds(), REALABS, SCIP_Bool, SCIP_CALL, SCIP_CONSADDED, SCIP_CUTOFF, SCIP_DIDNOTFIND, SCIP_INVALIDDATA, SCIP_OKAY, SCIP_PRESOLTIMING_MEDIUM, SCIP_Real, SCIP_REDUCEDDOM, SCIP_SUCCESS, SCIP_VARTYPE_CONTINUOUS, SCIP_VARTYPE_IMPLINT, SCIPABORT, SCIPaddCoefLinear(), SCIPaddCons(), SCIPallowDualReds(), SCIPallowObjProp(), SCIPchgVarType(), SCIPconsGetData(), SCIPconsGetName(), SCIPconshdlrGetData(), SCIPconsIsChecked(), SCIPconsIsDeleted(), SCIPconsIsDynamic(), SCIPconsIsEnforced(), SCIPconsIsInitial(), SCIPconsIsLocal(), SCIPconsIsModifiable(), SCIPconsIsPropagated(), SCIPconsIsRemovable(), SCIPconsIsSeparated(), SCIPconsIsStickingAtNode(), SCIPcreateConsLinear(), SCIPcreateConsVarbound(), SCIPdebugMessage, SCIPdebugPrintCons, SCIPdelCons(), SCIPerrorMessage, SCIPinfinity(), SCIPisEQ(), SCIPisInfinity(), SCIPisIntegral(), SCIPreleaseCons(), SCIPvarGetName(), SCIPvarGetType(), SCIPvarIsBinary(), SIGN, and TRUE.

static SCIP_DECL_CONSRESPROP ( consRespropAbspower )

static

resolves a propagation on the given variable by supplying the variables needed for applying the corresponding propagation rule (see propagateCons()): (1) left hand side and bounds on z -> lower bound on x (2) left hand side and upper bound on x -> bound on z (3) right hand side and bounds on z -> upper bound on x (4) right hand side and lower bound on x -> bound on z

Definition at line 6431 of file cons_abspower.c.

References NULL, resolvePropagation(), SCIP_CALL, SCIP_OKAY, and SCIP_SUCCESS.

static SCIP_DECL_CONSLOCK ( consLockAbspower )

static

variable rounding lock method of constraint handler

Definition at line 6444 of file cons_abspower.c.

References NULL, SCIP_Bool, SCIP_CALL, SCIP_OKAY, SCIPaddVarLocks(), SCIPconsGetData(), and SCIPisInfinity().

static SCIP_DECL_CONSACTIVE ( consActiveAbspower )

static

constraint activation notification method of constraint handler

Definition at line 6502 of file cons_abspower.c.

References FALSE, NULL, SCIP_OKAY, and SCIPconshdlrGetData().

static SCIP_DECL_CONSENABLE ( consEnableAbspower )

static

constraint enabling notification method of constraint handler

Definition at line 6519 of file cons_abspower.c.

References catchVarEvents(), NULL, SCIP_CALL, SCIP_OKAY, and SCIPconshdlrGetData().

static SCIP_DECL_CONSDISABLE ( consDisableAbspower )

static

constraint disabling notification method of constraint handler

Definition at line 6538 of file cons_abspower.c.

References dropVarEvents(), NULL, SCIP_CALL, SCIP_OKAY, and SCIPconshdlrGetData().

static SCIP_DECL_CONSPRINT ( consPrintAbspower )

static

constraint display method of constraint handler

Definition at line 6557 of file cons_abspower.c.

References NULL, SCIP_CALL, SCIP_OKAY, SCIPconsGetData(), SCIPinfoMessage(), SCIPisEQ(), SCIPisInfinity(), SCIPwriteVarName(), and TRUE.

static SCIP_DECL_CONSCHECK ( consCheckAbspower )

static

feasibility check method of constraint handler for integral solutions

Definition at line 6604 of file cons_abspower.c.

References computeViolation(), MAX, NULL, proposeFeasibleSolution(), SCIP_Bool, SCIP_CALL, SCIP_FEASIBLE, SCIP_INFEASIBLE, SCIP_INVALID, SCIP_OKAY, SCIP_Real, SCIP_STAGE_PROBLEM, SCIP_STAGE_SOLVED, SCIPconsGetData(), SCIPconsGetName(), SCIPconshdlrGetData(), SCIPfeastol(), SCIPgetStage(), SCIPinfoMessage(), SCIPisGT(), and SCIPupdateStartpointHeurSubNlp().

static SCIP_DECL_CONSCOPY ( consCopyAbspower )

static

constraint copying method of constraint handler

Definition at line 6668 of file cons_abspower.c.

References FALSE, NULL, SCIP_CALL, SCIP_OKAY, SCIPconsGetData(), SCIPconsGetName(), SCIPcreateConsAbspower(), SCIPgetVarCopy(), and TRUE.

static SCIP_DECL_CONSPARSE ( consParseAbspower )

static

constraint parsing method of constraint handler

Definition at line 6706 of file cons_abspower.c.

References FALSE, NULL, SCIP_CALL, SCIP_INVALIDDATA, SCIP_OKAY, SCIP_Real, SCIP_VERBLEVEL_MINIMAL, SCIPABORT, SCIPcreateConsAbspower(), SCIPdebugMessage, SCIPinfinity(), SCIPparseVarName(), SCIPstrToRealValue(), SCIPverbMessage(), and TRUE.

static SCIP_DECL_CONSGETVARS ( consGetVarsAbspower )

static

constraint method of constraint handler which returns the variables (if possible)

Definition at line 6869 of file cons_abspower.c.

References FALSE, NULL, SCIP_OKAY, SCIPconsGetData(), and TRUE.

static SCIP_DECL_CONSGETNVARS ( consGetNVarsAbspower )

static

constraint method of constraint handler which returns the number of variables (if possible)

Definition at line 6893 of file cons_abspower.c.

References SCIP_OKAY, and TRUE.

SCIP_RETCODE SCIPincludeConshdlrAbspower ( SCIP * scip )

creates the handler for absolute power constraints and includes it in SCIP

Parameters

scip	SCIP data structure

Definition at line 6906 of file cons_abspower.c.

Referenced by SCIP_DECL_CONSHDLRCOPY(), and SCIPincludeDefaultPlugins().

SCIP_RETCODE SCIPcreateConsAbspower	(	SCIP *	scip,
		SCIP_CONS **	cons,
		const char *	name,
		SCIP_VAR *	x,
		SCIP_VAR *	z,
		SCIP_Real	exponent,
		SCIP_Real	xoffset,
		SCIP_Real	zcoef,
		SCIP_Real	lhs,
		SCIP_Real	rhs,
		SCIP_Bool	initial,
		SCIP_Bool	separate,
		SCIP_Bool	enforce,
		SCIP_Bool	check,
		SCIP_Bool	propagate,
		SCIP_Bool	local,
		SCIP_Bool	modifiable,
		SCIP_Bool	dynamic,
		SCIP_Bool	removable,
		SCIP_Bool	stickingatnode
	)

creates and captures a absolute power constraint

Note: the constraint gets captured, hence at one point you have to release it using the method SCIPreleaseCons()

Parameters

scip	SCIP data structure
cons	pointer to hold the created constraint
name	name of constraint
x	nonlinear variable x in constraint
z	linear variable z in constraint
exponent	exponent n of \|x+offset\|^n term in constraint
xoffset	offset in \|x+offset\|^n term in constraint
zcoef	coefficient of z in constraint
lhs	left hand side of constraint
rhs	right hand side of constraint
initial	should the LP relaxation of constraint be in the initial LP? Usually set to TRUE. Set to FALSE for 'lazy constraints'.
separate	should the constraint be separated during LP processing? Usually set to TRUE.
enforce	should the constraint be enforced during node processing? TRUE for model constraints, FALSE for additional, redundant constraints.
check	should the constraint be checked for feasibility? TRUE for model constraints, FALSE for additional, redundant constraints.
propagate	should the constraint be propagated during node processing? Usually set to TRUE.
local	is constraint only valid locally? Usually set to FALSE. Has to be set to TRUE, e.g., for branching constraints.
modifiable	is constraint modifiable (subject to column generation)? Usually set to FALSE. In column generation applications, set to TRUE if pricing adds coefficients to this constraint.
dynamic	is constraint subject to aging? Usually set to FALSE. Set to TRUE for own cuts which are seperated as constraints.
removable	should the relaxation be removed from the LP due to aging or cleanup? Usually set to FALSE. Set to TRUE for 'lazy constraints' and 'user cuts'.
stickingatnode	should the constraint always be kept at the node where it was added, even if it may be moved to a more global node? Usually set to FALSE. Set to TRUE to for constraints that represent node data.

Definition at line 7028 of file cons_abspower.c.

References BMSclearMemory, CONSHDLR_NAME, NULL, pow(), REALABS, SCIP_CALL, SCIP_OKAY, SCIP_PLUGINNOTFOUND, SCIPallocMemory, SCIPcreateCons(), SCIPerrorMessage, SCIPfindConshdlr(), SCIPisEQ(), SCIPisInfinity(), SCIPisZero(), SCIPmarkDoNotMultaggrVar(), SCIPvarIsActive(), and square().

Referenced by presolveFindDuplicates(), SCIP_DECL_CONSCOPY(), SCIP_DECL_CONSPARSE(), SCIP_DECL_EXPRGRAPHNODEREFORM(), SCIP_DECL_NONLINCONSUPGD(), SCIP_DECL_QUADCONSUPGD(), and SCIPcreateConsBasicAbspower().

SCIP_RETCODE SCIPcreateConsBasicAbspower	(	SCIP *	scip,
		SCIP_CONS **	cons,
		const char *	name,
		SCIP_VAR *	x,
		SCIP_VAR *	z,
		SCIP_Real	exponent,
		SCIP_Real	xoffset,
		SCIP_Real	zcoef,
		SCIP_Real	lhs,
		SCIP_Real	rhs
	)

creates and captures an absolute power constraint in its most basic version, i. e., all constraint flags are set to their basic value as explained for the method SCIPcreateConsAbspower(); all flags can be set via SCIPsetConsFLAGNAME-methods in scip.h

See Also: SCIPcreateConsAbspower() for information about the basic constraint flag configuration

Note: the constraint gets captured, hence at one point you have to release it using the method SCIPreleaseCons()

Parameters

scip	SCIP data structure
cons	pointer to hold the created constraint
name	name of constraint
x	nonlinear variable x in constraint
z	linear variable z in constraint
exponent	exponent n of \|x+offset\|^n term in constraint
xoffset	offset in \|x+offset\|^n term in constraint
zcoef	coefficient of z in constraint
lhs	left hand side of constraint
rhs	right hand side of constraint

Definition at line 7129 of file cons_abspower.c.

References FALSE, NULL, SCIP_CALL, SCIP_OKAY, SCIPcreateConsAbspower(), and TRUE.

SCIP_RETCODE SCIPgetNlRowAbspower	(	SCIP *	scip,
		SCIP_CONS *	cons,
		SCIP_NLROW **	nlrow
	)

gets the absolute power constraint as a nonlinear row representation

Parameters

scip	SCIP data structure
cons	constraint
nlrow	a buffer where to store pointer to nonlinear row

Definition at line 7151 of file cons_abspower.c.

References CONSHDLR_NAME, createNlRow(), NULL, SCIP_CALL, SCIP_OKAY, SCIPconsGetData(), SCIPconsGetHdlr(), and SCIPconshdlrGetName().

SCIP_VAR* SCIPgetNonlinearVarAbspower	(	SCIP *	scip,
		SCIP_CONS *	cons
	)

gets nonlinear variable x in absolute power constraint

Parameters

scip	SCIP data structure
cons	absolute power constraint

Definition at line 7177 of file cons_abspower.c.

References CONSHDLR_NAME, NULL, SCIPconsGetData(), SCIPconsGetHdlr(), and SCIPconshdlrGetName().

Referenced by SCIPwriteGms(), and SCIPwritePip().

SCIP_VAR* SCIPgetLinearVarAbspower	(	SCIP *	scip,
		SCIP_CONS *	cons
	)

gets linear variable z in absolute power constraint

Parameters

scip	SCIP data structure
cons	absolute power constraint

Definition at line 7194 of file cons_abspower.c.

References CONSHDLR_NAME, NULL, SCIPconsGetData(), SCIPconsGetHdlr(), and SCIPconshdlrGetName().

Referenced by SCIPwriteGms(), and SCIPwritePip().

SCIP_Real SCIPgetExponentAbspower	(	SCIP *	scip,
		SCIP_CONS *	cons
	)

gets exponent in power term in absolute power constraint

Parameters

scip	SCIP data structure
cons	absolute power constraint

Definition at line 7211 of file cons_abspower.c.

References CONSHDLR_NAME, NULL, SCIPconsGetData(), SCIPconsGetHdlr(), and SCIPconshdlrGetName().

Referenced by SCIPwriteGms(), and SCIPwritePip().

SCIP_Real SCIPgetOffsetAbspower	(	SCIP *	scip,
		SCIP_CONS *	cons
	)

gets offset in power term in absolute power constraint

Parameters

scip	SCIP data structure
cons	absolute power constraint

Definition at line 7228 of file cons_abspower.c.

References CONSHDLR_NAME, NULL, SCIPconsGetData(), SCIPconsGetHdlr(), and SCIPconshdlrGetName().

Referenced by SCIPwriteGms(), and SCIPwritePip().

SCIP_Real SCIPgetCoefLinearAbspower	(	SCIP *	scip,
		SCIP_CONS *	cons
	)

gets coefficient of linear variable in absolute power constraint

Parameters

scip	SCIP data structure
cons	absolute power constraint

Definition at line 7245 of file cons_abspower.c.

References CONSHDLR_NAME, NULL, SCIPconsGetData(), SCIPconsGetHdlr(), and SCIPconshdlrGetName().

Referenced by SCIPwriteGms(), and SCIPwritePip().

SCIP_Real SCIPgetLhsAbspower	(	SCIP *	scip,
		SCIP_CONS *	cons
	)

gets left hand side in absolute power constraint

Parameters

scip	SCIP data structure
cons	absolute power constraint

Definition at line 7262 of file cons_abspower.c.

References CONSHDLR_NAME, NULL, SCIPconsGetData(), SCIPconsGetHdlr(), and SCIPconshdlrGetName().

Referenced by SCIPwriteGms(), and SCIPwritePip().

SCIP_Real SCIPgetRhsAbspower	(	SCIP *	scip,
		SCIP_CONS *	cons
	)

gets right hand side in absolute power constraint

Parameters

scip	SCIP data structure
cons	absolute power constraint

Definition at line 7279 of file cons_abspower.c.

References CONSHDLR_NAME, NULL, SCIPconsGetData(), SCIPconsGetHdlr(), and SCIPconshdlrGetName().

Referenced by SCIPwriteGms(), and SCIPwritePip().

SCIP_Real SCIPgetViolationAbspower	(	SCIP *	scip,
		SCIP_CONS *	cons,
		SCIP_SOL *	sol
	)

gets the absolute violation of a absolute power constraint by a solution

Parameters

scip	SCIP data structure
cons	absolute power constraint
sol	LP solution

Definition at line 7296 of file cons_abspower.c.

References CONSHDLR_NAME, NULL, pow(), REALABS, SCIP_Real, SCIPconsGetData(), SCIPconsGetHdlr(), SCIPconshdlrGetName(), SCIPdebugMessage, SCIPgetSolVal(), and SIGN.

Variable Documentation

SCIP_Real roots[ROOTS_KNOWN+1]

static

Initial value:

= {
   -1.0,                     
   -1.0,                     
   0.41421356237309504880,   
   0.5,                      
   0.56042566045031785945,   
   0.60582958618826802099,   
   0.64146546982884663257,   
   0.67033204760309682774,   
   0.69428385661425826738,   
   0.71453772716733489700,   
   0.73192937842370733350    
}

The positive root of the polynomial (n-1) y^n + n y^(n-1) - 1 is needed in separation. Here we store these roots for small integer values of n.

Definition at line 88 of file cons_abspower.c.

Referenced by SCIP_DECL_CONSINITSOL().

SCIP

Detailed Description

Macros

Typedefs

Enumerations

Functions

Variables

Macro Definition Documentation

Typedef Documentation

Enumeration Type Documentation

Function Documentation

Variable Documentation